An Element on the Move
   An interactive game that puts you in charge of carbon as you cycle through different earth features and organisms.
   http://www.open2.net/science/element/html/

Carbon Cycle
   Diagrams and an explanation of the carbon cycle, including how humans are impacting the balance.
   http://www.cotf.edu/ete/modules/carbon/efcarbon.html

Chemical Carousel: A Trip Around the Carbon Cycle
   A complete look at carbon and its role in the environment and living things.
   http://library.thinkquest.org/11226/

Concept Map on Carbon Cycle
   Detailed concept map.
   http://www.fed.cuhk.edu.hk/~johnson/misconceptions/concept_map/carbon_cycle.html

EO Library: The Carbon Cycle
   NASA's explanation of the carbon cycle, including descriptions of missions to study the global cycle.
   http://earthobservatory.nasa.gov/Library/CarbonCycle/

Global Carbon Cycle - The Woods Hole Research Center
   A look at carbon and land use, missing carbon sinks, and how forests sequester carbon dioxide. Includes numerous graphs.
   http://www.whrc.org/carbon/

SeaWiFS Views the Global Carbon Cycle
   NASA's visible earth project shows photosynthetic productivity for the earth in animated images of the earth.
   http://visibleearth.nasa.gov/view_rec.php?vev1id=7650

The Carbon Cycle
   Why carbon is so important, how humans have interfered, and probable effects.
   http://library.thinkquest.org/11353/carbon.htm

The EPA Global Warming Kids Page--Carbon Cycle Animation
   Animations of how global warming occurs and how it is linked to the carbon and water cycles.
   http://www.epa.gov/globalwarming/kids/carbon_cycle_version2.html